This is the large diameter Mercury Pulley that can be used on their sea water pumps. I believe it was used on the axius systems but please confirm. Part number is 8M2013638 and it has been media blasted and painted Mercury Phantom Black. It is in very good condition. It fits pumps 8M0139995, 8M0139996, 8M0139997 and all their preceding part numbers. Diameter is 7" and it is a serpentine belt pulley.